DE102019117920A1 - Suction device and method for cleaning a filter - Google Patents

Abstract

A suction device is provided, comprising a suction unit (16) for generating a suction flow (40), at least one filter (22), and a filter cleaning device (28), the filter cleaning device (28) having at least one valve (42) with a movable closing body (44) and a counter device (74) for the closing body (44), and wherein in an open position (108) of the at least one valve (42) the at least one filter (22) is acted upon by a cleaning flow and in a closed position (90) of the at least one valve (42) the cleaning flow is or becomes inactive, characterized in that the closing body (44) has at least one first contact area (70) on the counter device (74) and a second contact area (72) to the mating device (74), the second contact area (72) being at a distance from the first contact area (70) in a height direction (48) that in the closed position (90) of the at least one valve (42), both the first contact area (70) and the second contact area (72) are in contact with the counter device (74), and that both the first contact area ( 70) and the second contact area (72) are spaced apart from the counter device (74), wherein in the open position (108) of the at least one valve (42) a purge air flow is applied to both the first contact area (70) and the second contact area (72) flows past to the filter (22).

Description

The invention relates to a suction device, comprising a suction unit for generating a suction flow, at least one filter, and a filter cleaning device, the filter cleaning device having at least one valve with a movable closing body and a counter-device for the closing body, and wherein in an open position of the at least one valve, the at least one filter is acted upon by a cleaning flow and, in a closed position of the at least one valve, the cleaning flow is or becomes inactive.

The invention also relates to a method for cleaning a filter.

The EP 2 451 332 B1 relates to a suction device for cleaning purposes, which comprises a valve device with a valve seat forming an external air inlet and a valve body movable relative to it, which in a closed position rests sealingly on the valve seat and in an open position releases the valve seat. The suction device comprises an energy storage device, to which energy to be stored can be supplied by actuation of an actuating element and which can be released from the stored energy for transferring the valve body from a closed position to an open position. The energy storage device comprises at least one elastically deformable energy storage element, the at least one energy storage element being designed as a spring.

The DE 10 2010 029 518 A1 discloses a vacuum cleaner with a dirt collection container, which has a suction inlet and is in flow connection with a suction unit via at least one filter and a suction line, and with a scavenging air supply device for supplying scavenging air into the suction line downstream of the filter, the scavenging air supply device having at least one scavenging air opening and one sleeve-shaped closing body which, in a closed position, prevents scavenging air from flowing into the suction line via the at least one scavenging air opening and which can be manually moved in one direction of movement into a release position that allows scavenging air to flow into the suction line via the at least one scavenging air opening. The closing body is open at both ends and in the closed position prevents scavenging air from flowing into the suction line through the at least one scavenging air opening with at least two interacting sealing elements that can be displaced relative to one another in the direction of movement.

The DE 10 2010 029 524 A1 discloses a vacuum cleaner with a dirt collecting container which has a suction inlet and is in flow connection with a suction unit via at least one filter and a suction line, and with a scavenging air supply device for supplying scavenging air into the suction line downstream of the filter, the scavenging air supply device having at least one scavenging air opening, and a closing body with a front side facing the suction line and a rear side facing away from the suction line, which can be moved back and forth between a closed position in which it closes the purge air opening and a release position in which it releases the purge air opening. The closing body can be moved into its release position by applying negative pressure to its rear side against a restoring force.

The EP 2 672 871 B1 discloses a vacuum cleaner with a battery device for supplying energy to an external air valve device. A control device is provided which controls the cleaning of a filter device by means of the external air valve device, the cleaning being triggered manually or automatically, and the control device controlling an electric motor device of a suction unit.

The WO 2014/173481 A1 discloses a vacuum cleaner with cleaning control for a filter.

The DE 10 2011 015 074 A1 discloses a suction device with a suction motor to which a motor sensor is assigned. The engine sensor is used to generate a suction engine sensor signal. A control device is provided for controlling a cleaning device for carrying out a cleaning process of a filter as a function of the suction motor sensor signal.

The DE 10 2016 125 385 A1 discloses a vacuum cleaner.

The EP 3 120 744 B1 discloses an apparatus for controlling cleaning of a filter unit for vacuum cleaners.

The DE 10 2013 108 559 A1 discloses a method of operating a vacuum cleaner to clean back a filter element comprised by the vacuum cleaner.

The DE 20 2010 012 821 U1 discloses a filter cleaning system for vacuum cleaners with an external fan.

The DE 101 01 219 C9 discloses a vacuum cleaner.

The US 2005/0011036 A1 discloses a vacuum cleaner.

The DE 10 2005 017 702 A1 discloses a method of cleaning the filters of a vacuum cleaner.

The EP 2 347 690 B1 discloses a vacuum cleaner.

The CN 101484060 B also discloses a vacuum cleaner.

The invention is based on the object of providing a suction device of the type mentioned at the outset, it being possible to achieve effective cleaning of the at least one filter.

This object is achieved according to the invention in the suction device mentioned at the outset in that the closing body has at least a first contact area on the counter-device and a second contact area on the counter-device, the second contact area being at a height from the first contact area that is in the closed position of the at least one valve, both the first contact area and the second contact area are in contact with the counter device, and that in the open position of the at least one valve both the first contact area and the second contact area are spaced from the counter device, with the at least a valve, a flow of purge air flows past both the first contact area and the second contact area to which at least one filter flows.

Because the closing body has (at least) a first contact area and a second contact area offset from the first contact area, sealing in the closed position of the at least one valve on the mating device can be achieved over (at least) two levels. When the valve is opened, purge air can then flow into the at least one filter on (at least) two separate levels.

The open position of the at least one valve is understood to mean all positions in which the closing body is lifted from the counter device. It can be a plurality of positions, that is, it does not have to be a single position.

The plurality of delivery areas enables the at least one valve to be opened quickly. This in turn enables a good cleaning result for the at least one filter. It can be achieved that a large volume flow of a flushing flow (external air flow) is present at the at least one filter within a short time. It has been shown that a time profile of a volume of backwash air over the at least one filter (which results in the cleaning flow) is steep.

Furthermore, a high level for an amount of scavenging air (for an amount of cleaning air) which acts on the at least one filter results relatively quickly.

In this way, an optimized cleaning result for the at least one filter can be achieved in particular even with a suction fan with lower power, such as for example with a suction device which is battery-operated. This enables a permanently constant suction power to be achieved.

In the solution according to the invention, partial flows of scavenging air can be achieved at the at least one valve when the valve is opened. In particular, a partial flow can flow past the closing body to the at least one filter and a partial flow can flow through the closing body to the at least one valve. Due to the at least two contact areas, which are offset in height, at least two gaps, in particular in the form of annular gaps with a relatively large diameter, can be opened quickly when the at least one valve is opened. It can be achieved that an opening cross-section increases with the valve lift. This also helps to ensure that an optimized cleaning result is achieved.

It is also possible to design the first contact area and the second contact area differently with respect to a pressure-effective area. Depending on the design, it can be achieved, for example, that a pressure difference between a negative pressure and a normal pressure area keeps the closing body in the closed position of the at least one valve in the closed position, or it can be achieved that the pressure difference strives to keep the closing body of the at least to drive a valve from the closed position to the open position. This also contributes to obtaining a rapid opening of the at least one valve and thereby obtaining a large air cross section.

It has also been shown that with the solution according to the invention, popping noises which are generated by the opening of the at least one valve are reduced.

The suction device according to the invention can be used, for example, in a vacuum cleaner in the form of a stand-alone device. For example, it can also be integrated into a machine that has other functions in addition to the suction device, such as a mobile floor cleaning machine (such as a sweeper). It can also be implemented on a robot vacuum cleaner, for example. An inventive The suction device can, for example, also be integrated into a permanently installed suction system.

It is provided in particular that a distance between the first contact area and the second contact area in the height direction is at least 6 mm and preferably at least 10 mm.

A movement stroke of the closing body, which is in particular a linear stroke, is in particular at least 5 mm. This movement stroke is preferably at most 50 mm.

In particular, a negative pressure area is provided in suction operation, on which the at least one filter is arranged, and a normal pressure area is provided, on which the counter device is arranged, the normal pressure area being fluid-tightly separated from the negative pressure area in the closed position of the at least one valve , and in the open position of the at least one valve, the normal pressure area and the negative pressure area are fluidly connected to one another by a channel device. In “normal operation” of the suction device, without the at least one valve for cleaning the at least one filter being active, the normal pressure area is separated from the negative pressure area in a fluid-tight manner. When the at least one valve is activated to clean the at least one filter, the closing body is lifted from the opposite direction. Due to the pressure difference between the normal pressure area and the negative pressure area, a purge air flow is created which is used to clean the at least one filter. The normal pressure area is an area on which the suction unit does not act with its negative pressure. For example, there is atmospheric pressure in the normal pressure range. However, it can also be provided that in the normal pressure range there is an excess pressure compared to atmospheric pressure. For example, it is provided in the exemplary embodiment of a sweeping machine that an overpressure compared to atmospheric pressure is generated in the normal pressure range via a compressor.

In particular, the cleaning flow is generated or is generated by bringing the at least one valve from the closed position into the open position. As a result, by opening the valve, a corresponding cleaning flow can be generated “automatically” in that external air can flow in and act on at least one filter.

It is particularly advantageous if the channel device opens into the normal pressure area on the inlet side and into the negative pressure area on the outlet side. In this way, a cleaning current to act on the at least one filter can be generated in a simple manner.

It is particularly advantageous if an inlet cross-section for air into the duct device, which is in particular at a gap and preferably an annular gap, increases steadily with a valve stroke when the closing body is lifted from the counter device. As a result, the valve can be opened quickly and a relatively large volume flow can be quickly provided to the at least one filter for cleaning.

In one embodiment it is provided that the cleaning flow is or is generated while a suction flow is being applied to the at least one filter by the suction unit. As a result, the at least one valve can be cleaned to a certain extent during ongoing operation. This results in, among other things, a simple control of a cleaning process.

• - die Höhenrichtung ist parallel zu einer Bewegungsrichtung und insbesondere Verschiebungsrichtung des Schließkörpers;
• - die Höhenrichtung ist parallel zu einer Hauptströmungsrichtung eines Saugstroms bei Durchströmung des mindestens einen Filters in einem Saugbetrieb;
• - die Höhenrichtung ist parallel zu einer Hauptströmungsrichtung des Abreinigungsstroms bei Durchströmung des mindestens einen Filters;
• - die Höhenrichtung ist quer und insbesondere senkrecht zu einer Einhüllendenoberfläche des mindestens einen Filters an einer Reinseite;
• - die Höhenrichtung ist parallel zu einer Symmetrieachse des mindestens einen Ventils.

In particular, at least one of the following is provided:

• the height direction is parallel to a direction of movement and in particular the direction of displacement of the closing body;
• the vertical direction is parallel to a main flow direction of a suction flow when it flows through the at least one filter in suction mode;
• the vertical direction is parallel to a main flow direction of the cleaning flow when it flows through the at least one filter;
• the height direction is transverse and in particular perpendicular to an envelope surface of the at least one filter on a clean side;
• - The height direction is parallel to an axis of symmetry of the at least one valve.

The filter cleaning device can be designed to be compact and integrated into the suction device through the corresponding orientation of the height direction. The at least one valve can be opened quickly.

The counter-device preferably has a first counter-contact area for the first contact area and a second counter-contact area for the second contact area, the second counter-contact area and the first counter-contact area being spaced apart from one another in the vertical direction. As a result, in the closed position of the at least one valve, the closing body can be easily attached to the closing body via at least two contact areas which are offset in height Create counter device. In particular, the first counter-contact area and the second counter-contact area are at a distance of at least 6 mm and preferably of at least 10 mm in the height direction. Advantageously, the counter device is designed such that when the at least one valve changes from the closed position to the open position, the first contact area and the second contact area lift at least approximately simultaneously from the counter device. Accordingly, it is preferably provided that the first contact area and the second contact area bear at least approximately simultaneously on the mating device when the closing body passes from the open position to the closed position.

In order to achieve fluid tightness in the contact areas, it is provided that the first contact area and the second contact area are each assigned a sealing device, in particular in the form of a sealing ring, the sealing device in particular being arranged on the closing body and / or the sealing device on the counter-device is arranged. The sealing device ensures a fluid-tight seal. It contacts the closing body and the counter device.

It is favorable if the counter device has a housing in which the closing body is movably arranged and which has a through-flow space for scavenging air. The housing can be used to arrange the at least one valve in a protected manner. The housing can also be used to guide the flow.

• - die Unterdruckkammer ist mit dem Saugaggregat verbunden;
• - in einem Saugbetrieb der Saugvorrichtung ist die Unterdruckkammer permanent fluidwirksam mit dem Saugaggregat verbunden;
• - mindestens ein Kanal der Filter-Abreinigungseinrichtung mündet zur Luftzuführung zu dem mindestens einen Filter in einem Abreinigungsbetrieb in die Unterdruckkammer;
• - die Gegeneinrichtung ist an der Unterdruckkammer angeordnet;
• - das mindestens eine Ventil trennt die Unterdruckkammer in einer geschlossenen Stellung des mindestens einen Ventils fluiddicht von einem Normaldruckbereich.

It is favorable if a clean side of the at least one filter is located on a vacuum chamber, in particular with at least one of the following:

• - The vacuum chamber is connected to the suction unit;
• - In a suction mode of the suction device, the vacuum chamber is permanently fluidly connected to the suction unit;
• - At least one channel of the filter cleaning device opens into the vacuum chamber for air supply to the at least one filter in a cleaning operation;
• - The counter device is arranged on the vacuum chamber;
• the at least one valve separates the vacuum chamber in a closed position of the at least one valve in a fluid-tight manner from a normal pressure area.

The result is simple flow guidance if a clean side of the at least one filter is located on a vacuum chamber. The vacuum chamber can be sealed in a simple manner in a fluid-tight manner with respect to a normal pressure area of the suction device by the at least one valve. By connecting the vacuum chamber to the suction unit and in particular by means of a permanent fluid-active connection (in suction mode), a suction flow can easily be carried out through the at least one filter, in particular to connect a suction container, a suction connection and, for example, a suction hose or a suction pipe to the To apply suction flow. One or more channels of the filter cleaning device which open into the negative pressure chamber can be used to provide flushing air for cleaning the at least one filter.

Positioning the counter device on the vacuum chamber results in a compact design for the suction device with the filter cleaning device.

It is favorable if the at least one valve and / or the closing body is designed to be rotationally symmetrical to the axis of symmetry, in particular the axis of symmetry being parallel to the height direction. This results in an optimized air supply to the at least one filter in order to achieve effective cleaning.

The object mentioned at the beginning is also achieved according to the invention in that the closing body and the counter device are adapted to one another in such a way that when the at least one valve is in the open position, a plurality of separate air partial flows flows through the filter cleaning device, and in particular a first partial flow through the Closing body past the outside and a second partial flow through the closing body to which at least one filter flows. A quick opening of the at least one valve can thus be achieved in a simple manner. The at least one filter can be subjected to a large volume flow during a cleaning process.

The aforementioned object is also achieved according to the invention in that the filter cleaning device has at least one first channel for a first partial flow and a second channel for a second partial flow in the open position of the at least one valve, the second channel being separate from the first channel is. This enables the at least one valve to be opened quickly. During a cleaning process of the at least one filter, it can be subjected to a high volume flow of scavenging air.

• - der erste Kanal mündet eingangsseitig in einen Normaldruckbereich;
• - der zweite Kanal mündet eingangsseitig in den Normaldruckbereich;
• - der erste Kanal mündet ausgangsseitig in einen Unterdruckbereich;
• - der zweite Kanal mündet ausgangsseitig in den Unterdruckbereich;
• - in der geschlossenen Stellung des mindestens einen Ventils ist der erste Kanal eingangsseitig zu dem Normaldruckbereich geschlossen;
• - in der offenen Stellung des mindestens einen Ventils ist der erste Kanal eingangsseitig zu dem Normaldruckbereich offen;
• - der erste Kanal ist ausgangsseitig permanent fluidwirksam mit dem Unterdruckbereich verbunden;
• - in der geschlossenen Stellung des mindestens einen Ventils ist der zweite Kanal ausgangsseitig zu dem Unterdruckbereich geschlossen;
• - in der offenen Stellung des mindestens einen Ventils ist der zweite Kanal ausgangsseitig zu dem Unterdruckbereich offen;
• - der zweite Kanal ist eingangsseitig permanent mit dem Normaldruckbereich fluidwirksam verbunden.

In particular, at least one of the following is provided:

• the first channel opens on the inlet side into a normal pressure area;
• - The second channel opens on the inlet side into the normal pressure range;
• - The first channel opens on the outlet side into a negative pressure area;
• - The second channel opens on the outlet side into the negative pressure area;
• - In the closed position of the at least one valve, the first channel is closed on the inlet side to the normal pressure range;
• - In the open position of the at least one valve, the first channel is open on the inlet side to the normal pressure range;
• the first channel is permanently connected to the negative pressure area on the output side in a fluidically effective manner;
• - In the closed position of the at least one valve, the second channel is closed on the outlet side to the negative pressure region;
• - In the open position of the at least one valve, the second channel is open on the output side to the negative pressure area;
• - The second channel is permanently connected to the normal pressure area on the inlet side in an effective fluid manner.

It can thereby be achieved in a simple manner by lifting the closing body from the counter device that scavenging air is supplied to the at least one filter both via the first channel and via the second channel. The at least one valve can be opened quickly and the at least one filter can be subjected to a high volume flow of scavenging air for its cleaning.

It is particularly advantageous if the first channel runs through the closing body with at least a partial area, and in particular the first channel is delimited at least in a partial area by an inner wall of the closing body. In this way, the at least one valve can be opened quickly. The at least one filter can be subjected to a large volume flow of scavenging air for cleaning the at least one filter within a relatively short time.

It is also advantageous if the first channel and / or the second channel runs at least in a partial area along a lateral outer contour of the closing body, and in particular a lateral outer wall of the closing body delimits the first channel and / or the second channel. An additional fluid path can thus be provided in order to achieve effective cleaning of the at least one filter when the at least one valve is open.

It is also favorable if the first channel and / or the second channel have at least one first area and at least one second area, the at least one first area being oriented transversely to the height direction and the at least one second area at least approximately parallel to the height direction is oriented and in a cleaning operation a main flow direction in the at least one first area is oriented transversely to the vertical direction and in particular is oriented radially, and in the at least one second area a main flow direction in the cleaning operation is at least approximately parallel to the vertical direction and in particular axially oriented. In this way, the at least one valve can be opened quickly. A relatively high volume flow can quickly be made available to the at least one filter for cleaning.

It is then advantageous if the first channel and / or the second channel have a deflection area for a flow deflection. In this way, purge air can be effectively fed to the at least one filter for cleaning purposes on the at least one filter.

• - an einem ersten Bereich des ersten Kanals ist mindestens ein Eingang des ersten Kanals angeordnet;
• - an einem zweiten Bereich des ersten Kanals ist mindestens ein Ausgang des ersten Kanals angeordnet;
• - an einem ersten Bereich des zweiten Kanals ist mindestens ein Eingang des zweiten Kanals angeordnet;
• - an einem zweiten Bereich des zweiten Kanals ist mindestens ein Ausgang des zweiten Kanals angeordnet.

In particular, at least one of the following is provided:

• - At least one inlet of the first channel is arranged in a first region of the first channel;
• - At least one outlet of the first channel is arranged in a second region of the first channel;
• - At least one inlet of the second channel is arranged in a first region of the second channel;
• At least one outlet of the second channel is arranged in a second area of the second channel.

In this way, effective flow guidance can be achieved with a compact design of the filter cleaning device. The at least one valve can be opened quickly and a high volume flow can be provided to the at least one filter for cleaning.

In one embodiment, the first channel and / or the second channel have first regions which are spaced apart in the height direction and between which there is a second region. It turns out that way an optimized flow guidance with deflection in order to provide the at least one filter with a high volume flow of scavenging air for cleaning.

• - in der offenen Stellung des mindestens einen Ventils ist ein erster Bereich des ersten Kanals zwischen einer Oberseite des Schließkörpers und der Gegeneinrichtung gebildet;
• - ein zweiter Bereich des ersten Kanals ist in dem Schließkörper gebildet;
• - in der offenen Stellung des mindestens einen Ventils sind ein oder mehrere erste Bereiche des zweiten Kanals und/oder des ersten Kanals und/oder ein oder mehrere zweite Bereiche des zweiten Kanals und/oder des ersten Kanals zwischen der Gegeneinrichtung und dem Schließkörper gebildet;
• - in der offenen Stellung des mindestens einen Ventils ist ein erster Bereich des zweiten Kanals zwischen einer Unterseite des Schließkörpers und der Gegeneinrichtung gebildet.

In particular, at least one of the following is provided:

• - In the open position of the at least one valve, a first region of the first channel is formed between an upper side of the closing body and the counter device;
• - A second region of the first channel is formed in the closing body;
• - In the open position of the at least one valve, one or more first areas of the second channel and / or of the first channel and / or one or more second areas of the second channel and / or of the first channel are formed between the counter device and the closing body;
• - In the open position of the at least one valve, a first region of the second channel is formed between an underside of the closing body and the counter device.

This results in an optimized flow guidance. It can be achieved that when at least one valve is open, purge air is supplied to the at least one filter both through the closing body and past the closing body. The at least one valve can be opened quickly with relatively little noise development and the at least one filter can be provided with a relatively large volume flow for cleaning the at least one filter.

• - der erste Kanal weist mindestens einen ersten Eingang und einen zu dem ersten Eingang beabstandeten zweiten Eingang auf;
• - der erste Kanal ist mindestens in einem Teilbereich im Querschnitt T-förmig;
• - der erste Kanal hat einen Querbereich, an welchem der erste Eingang und der zweite Eingang angeordnet sind, wobei an dem Querbereich ein Sammelbereich angeordnet ist, und wobei ausgehend von dem ersten Eingang ein erster Teilstrom zu dem Sammelbereich und ausgehend von dem zweiten Eingang ein zweiter Teilstrom jeweils zu dem Sammelbereich strömt;
• - der erste Kanal weist einen Sammelbereich auf, welcher Teilströme vereinigt und ein Vereinigungsstrom ist durch den Schließkörper hindurch zu dem mindestens einen Filter geführt.

In one embodiment, at least one of the following is provided:

• the first channel has at least one first input and one second input spaced apart from the first input;
• the first channel is T-shaped in cross section at least in a partial area;
• The first channel has a transverse area at which the first inlet and the second inlet are arranged, a collecting area being arranged at the transverse area, and a first partial flow starting from the first inlet to the collecting area and a second starting from the second inlet Partial flow flows to the collecting area in each case;
• the first channel has a collecting area which combines partial flows and a combined flow is guided through the closing body to the at least one filter.

Purge air can be coupled in at different points for a partial flow through the first input and the second input. For example, a first partial flow is generated, which flows radially inward, and a second partial flow is generated, which flows radially outward. This partial flow is combined at the collecting area and can then flow through the closing body. (There is also at least one further partial flow that flows past the flushing body.) In this way, a large amount of flushing air can be made available to the at least one filter for cleaning within a short time. The at least one valve can be opened quickly.

• - Unter-Anlagebereiche des zugehörigen ersten Anlagebereichs liegen bezogen auf die Höhenrichtung auf der gleichen Höhe;
• - Unter-Anlagebereiche des zweiten Anlagebereichs liegen bezogen auf die Höhenrichtung auf der gleichen Höhe;
• - ein erster Unter-Anlagebereich umgibt einen zweiten Unter-Anlagebereich;
• - Unter-Anlagebereiche sind konzentrisch zueinander;
• - zwischen Unter-Anlagebereichen ist ein Kanal durch den Schließkörper hindurch geführt.

It is then advantageous if the first contact area and / or the second contact area has a plurality of sub-contact areas, in particular with at least one of the following:

• - Sub-contact areas of the associated first contact area are at the same height in relation to the height direction;
• - Sub-contact areas of the second contact area are at the same height in relation to the height direction;
• a first sub-investment area surrounds a second sub-investment area;
• - Sub-contact areas are concentric to one another;
• - A channel is led through the closing body between sub-system areas.

It can thus be achieved in particular that the first channel has a plurality of inputs, these inputs being closed in the closed position of the at least one valve.

In one embodiment, the closing body has a first disc element and a second disc element spaced apart from the first disc element in the vertical direction, the first contact area being arranged or formed on the first disc element and the second contact area being arranged or formed on the second disc element, and wherein a connection area is positioned between the first disk element and the second disk element. The first disk element and the second disk element allow contact areas to be formed in a simple manner towards an upper side and towards a lower side. A wall of the mating device can be positioned between the first disk element and the second disk element in order to obtain an optimized purge air supply to the at least one filter during a cleaning process. The first disc element and / or the second disk element have a circular disk shape, for example.

In particular, an outer contour of the connection area is set back in relation to a lateral end of the first disk element and the second disk element. A partial flow of scavenging air can flow past this outer contour. By resetting the outer contour, a wall of the counter device can be positioned between the first disk element and the second disk element. The closing body can then be moved with respect to the wall, in particular a contact (for example via the first contact area) on this wall being possible. In this way, both a first channel and a second channel for supplying scavenging air to the at least one filter can be opened in a simple manner when the at least one valve is opened.

For example, the closing body is C-shaped or U-shaped in cross section at the connecting area. In this way, a recessed outer contour can be achieved in a simple manner, where, for example, a wall can be positioned between the first disk element and the second disk element.

It is particularly advantageous if the counter-device has a wall which protrudes into a space between the first disk element and the second disk element, the first contact area being in contact with the wall, in particular in the closed position of the at least one valve. This results in a compact design of the filter cleaning device. It is possible to open at least two separate channels for two separate partial flows by lifting the closing body from the counter device. This results in rapid opening of the at least one valve.

In particular, it is provided that the first contact area and the second contact area point in the same direction in relation to the height direction. The result is a compact structure.

In one embodiment, the first contact area on the first disk element points away from the at least one filter and the second contact area on the second disk element points away from the at least one filter. In an alternative embodiment, the first contact area on the first pane element faces the at least one filter and the second contact area on the second pane element likewise faces the at least one filter.

It is particularly advantageous if the first disk element and the second disk element have different diameters. Depending on whether the first disk element or the second disk element have a larger pressure-effective diameter, the closing body can be lifted automatically from the counter device due to a pressure difference between a negative pressure area and a normal pressure area, or due to the pressure difference at the counter device in the closed state of the at least one valve " automatically "hold.

It is favorable if the counter device and the closing body are designed to be adapted to one another in such a way that the closing body moves in the direction of the at least one filter when the at least one valve changes from the closed position to the open position.

Alternatively, it is possible that the counter device and the closing body are adapted to one another in such a way that when the at least one valve passes from the closed position to the open position, the closing body moves away from the at least one filter.

In one embodiment, the counter device has a first wall as a counter surface for the first contact area and has a second wall spaced apart in the height direction as a counter surface for the second contact area. The filter cleaning device can thus be made compact.

In particular, an opening on the counter device is arranged between the first wall and the second wall, which opening is in fluid connection with a normal pressure range, in particular a normal for an opening of the opening being oriented transversely to the height direction. In this way, at least one first channel and one second channel can be opened when the closing body is lifted off the counter device. The at least one valve can thus be opened quickly and the at least one filter can be subjected to a high volume flow of scavenging air.

It is then advantageous if the closing body with a first disk element and a spaced-apart second disk element overlaps the first wall. With a compact design of the filter cleaning device, both a first channel and a second channel, which are separate from one another, can be opened in a simple manner when the closing body is lifted from the counter-device.

In particular, the second contact area is movable between the first wall and the second wall. It can be one of those Achieve optimized purge air supply (external air coupling) to the at least one filter.

In one embodiment, a first space is formed between the second wall and the first wall, in which a second disk element of the closing body is movable, and a second space is formed between the first wall and a further wall, in which a first disk element of the closing body is movable is. This results in an optimized air supply to the at least one filter during a cleaning process.

Alternatively, it is possible for the first contact area to be movable between the first wall and the second wall.

It is then provided in particular that a first space is formed between the second wall and a further wall, in which a second disk element of the closing body is movable, and a second space is formed between the first wall and the second wall, in which a first Disc element of the closing body is movable.

In one embodiment, the filter cleaning device has a magnetic device. Depending on the design of the filter cleaning device, the closing body can be driven in its movement from the closed position into the open position via the magnet device, or the closing body can be held in the closed position of the at least one valve.

In one embodiment, the magnet device has a switchable lifting magnet and an armature is connected to the closing body, the movement of the closing body being drivable via a coupling of the armature to the lifting magnet. The lifting magnet works together with the armature. The armature and thus the closing body can be moved by energizing the lifting magnet. In particular, a lifting movement of the closing body can thus be carried out; as a result, the at least one valve in particular can be transferred from the closed position to the open position.

In an alternative embodiment, the magnet device comprises a switchable holding magnet, a counter-element for the holding magnet being connected to the closing body. In particular, the closed position of the at least one valve can be held via the holding magnet. If the holding magnet is energized accordingly, this holding position is canceled and the closing body can lift off from the counter device.

In one embodiment, a spring device is provided, the spring force of which tends to bring the at least one valve from the open position into the closed position. In particular, an automatic return from the open position to the closed position can thereby be achieved.

In one embodiment, a manual actuating element is provided which is connected to the closing body and is used for manual actuation of a cleaning process. Manual cleaning can thus be carried out.

In one embodiment, an elastic energy storage device is assigned to the at least one valve and / or an actuating element. Reference is made in this context to the EP 2 451 332 B1 . In this way, in particular, rapid opening of the at least one valve can be achieved.

It is favorable if pressure-effective areas for the first contact area and the second contact area are different. Due to pressure differences in a normal pressure range and a negative pressure range, depending on the design of the closing body, the closing body can be automatically held in the closed position without an additional external force being necessary, or the closing body can be lifted off the counter device without an additional external force is necessary.

In one embodiment, the pressure-acting surfaces are adapted to one another in such a way that when the suction device is in operation, the at least one valve is in the closed position due to a pressure difference on the pressure-acting surfaces. Due to a pressure difference between a normal pressure area and a negative pressure area, the closing body is then pressed against the counter device. An external force is required to lift the closing body from the counter device.

It is then provided in particular that the pressure-effective surfaces are designed to be adapted in such a way that a force must be exerted on the closing body for the transition from the closed position to the open position. This can be done, for example, using a lifting magnet.

In an alternative embodiment, the pressure-effective surfaces are designed to be adapted to one another in such a way that an external holding force is necessary to keep the at least one valve in the closed position when the suction device is in operation to keep. No external force is then necessary to lift the closing body from the counter-device. The external holding force is provided, for example, by a holding magnet.

In particular, when the holding force ceases, a pressure difference brings the at least one valve from the closed position to the open position, this transition then taking place automatically when the holding force ceases.

It is particularly advantageous if a battery device is provided for battery operation of the suction device. The battery device is in particular rechargeable. In particular, battery operation is provided both for the suction unit and for the filter cleaning device. The filter cleaning device according to the invention can be operated in an effective manner with optimized filter cleaning, even if the suction power is reduced, as can be the case with suction devices with battery operation.

According to the invention, a method for cleaning a filter is provided in which, by lifting a closing body of a valve from a counter device, the filter is acted upon with an air cleaning stream, with scavenging air flowing laterally past the closing body and through the closing body in an open position of the valve flows through the at least one filter, and / or wherein scavenging air is coupled in in the open position of the valve in a plurality of regions spaced apart in a height direction.

The method according to the invention has the advantages already explained in connection with the suction device according to the invention.

In particular, the valve can be opened quickly and the filter can be provided with a high volume flow of scavenging air for cleaning within a relatively short time.

The method according to the invention can be carried out on the suction device according to the invention or the suction device according to the invention can be operated with the method according to the invention with regard to cleaning.

In particular, it is advantageous if, in a closed position of the valve, the closing body rests against the counter device with a first contact area and with a second contact area spaced apart in a height direction, and when the valve is in the open position, scavenging air rests against both the first contact area and the second Plant area flows past to the filter. This allows the valve to open quickly. A large volume flow of external air (scavenging air) can be made available to the filter for cleaning the filter within a short period of time, and a cleaning flow can then be applied to the filter accordingly.

Further advantageous embodiments of the method according to the invention have already been explained in connection with the suction device according to the invention.

• 1 eine schematische Darstellung eines Ausführungsbeispiels einer Saugvorrichtung in Form eines Stand-alone-Staubsaugers;
• 2 eine schematische Schnittdarstellung eines ersten Ausführungsbeispiels einer erfindungsgemäßen Filter-Abreinigungseinrichtung in einer geschlossenen Stellung eines Ventils;
• 3 die Filter-Abreinigungseinrichtung gemäß 2 in einer offenen Stellung des Ventils;
• 4 schematisch einen zeitlichen Verlauf eines Volumens von Spülluft über einem Filter bei der Filter-Abreinigungseinrichtung gemäß 2 und im Vergleich dazu in durchbrochenen Linien einen Verlauf bei einer aus dem Stand der Technik bekannten Filter-Abreinigungseinrichtung;
• 5 eine schematische Schnittdarstellung eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Filter-Abreinigungseinrichtung bei geschlossenem Ventil;
• 6 die Filter-Abreinigungseinrichtung gemäß 5 bei offenem Ventil;
• 7 eine schematische Schnittansicht eines dritten Ausführungsbeispiels einer erfindungsgemäßen Filter-Abreinigungseinrichtung bei geschlossenem Ventil;
• 8 die Filter-Abreinigungseinrichtung gemäß 7 bei offenem Ventil;
• 9 eine schematische Schnittansicht eines vierten Ausführungsbeispiels einer erfindungsgemäßen Filter-Abreinigungseinrichtung bei geschlossenem Ventil;
• 10 die Filter-Abreinigungseinrichtung gemäß 9 bei offenem Ventil;
• 11 eine schematische Schnittansicht eines fünften Ausführungsbeispiels einer erfindungsgemäßen Filter-Abreinigungseinrichtung bei offenem Ventil;
• 12 eine schematische Schnittansicht eines sechsten Ausführungsbeispiels einer erfindungsgemäßen Filter-Abreinigungseinrichtung bei geschlossenem Ventil; und
• 13 die Filter-Abreinigungseinrichtung gemäß 12 bei offenem Ventil.

The following description of preferred embodiments is used in conjunction with the drawings to explain the invention in greater detail. Show it:

• 1 a schematic representation of an embodiment of a suction device in the form of a stand-alone vacuum cleaner;
• 2 a schematic sectional view of a first embodiment of a filter cleaning device according to the invention in a closed position of a valve;
• 3 the filter cleaning device according to 2 in an open position of the valve;
• 4th schematically shows a time profile of a volume of scavenging air over a filter in the filter cleaning device according to FIG 2 and in comparison therewith, in broken lines, a curve in a filter cleaning device known from the prior art;
• 5 a schematic sectional view of a second embodiment of a filter cleaning device according to the invention with the valve closed;
• 6th the filter cleaning device according to 5 with the valve open;
• 7th a schematic sectional view of a third embodiment of a filter cleaning device according to the invention with the valve closed;
• 8th the filter cleaning device according to 7th with the valve open;
• 9 a schematic sectional view of a fourth embodiment of a filter cleaning device according to the invention with the valve closed;
• 10 the filter cleaning device according to 9 with the valve open;
• 11 a schematic sectional view of a fifth embodiment of a filter cleaning device according to the invention with the valve open;
• 12th a schematic sectional view of a sixth embodiment of a filter cleaning device according to the invention with the valve closed; and
• 13th the filter cleaning device according to 12th with the valve open.

One embodiment of a suction device according to the invention is a vacuum cleaner 10 ( 1 ) in the form of a stand-alone device.

The vacuum cleaner 10 includes a suction material container 12th . In the suction material container 12th a receiving space for suction material is formed.

On the suction material container 12th In particular, there is a detachable suction head 14th . On the suction head 14th is a suction unit 16 arranged. In one embodiment, the suction unit comprises 16 a suction fan and a motor and in particular an electric motor, which drives one or more impellers of the suction fan in rotation.

The suction unit 16 generated during operation of the vacuum cleaner 10 a suction flow. The suction flow acts on the suction material container 12th .

On the suction material container 12th is a connection 18th for a suction hose or a suction tube 20th arranged.

It is also possible that the connection 18th on the suction head 14th is arranged and the connection 18th then fluid-effective with the suction material container 12th connected is.

The suction hose 20th can be subjected to the suction flow. Suction material can be fed into the suction material container through it 12th suck in.

The vacuum cleaner 10 has (at least) one filter 22nd on. The filter 22nd is between the suction material container 12th and the suction unit 16 arranged. It has a dirty side 24 on which the suction material container 12th facing, and has a clean side 26th on which the suction unit 16 is facing. The filter 22nd serves to hold back dirt particles so that they do not reach the suction unit 16 can get.

The filter 22nd in one embodiment is a flat-fold filter.

It is also possible that the filter is a cartridge filter, candle filter, bag filter, etc.

It is also possible that the vacuum cleaner 10 has several filters and in particular has filters with different filtering effects. In this context, the WO 2019/011429 A1 referenced.

The vacuum cleaner 10 includes a filter cleaning device 28 . In operation of the vacuum cleaner 10 Dirt particles can accumulate on the filter 22nd accumulate and "clog" them. This worsens the suction performance of the vacuum cleaner 10 . Through the filter cleaning device 28 lets the filter 22nd clean. The cleaning takes place in particular from the clean side 26th of the filter 22nd here. Through the filter cleaning device 28 can remove dirt particles from the filter 22nd loosen and put in the suction material container 12th to lead.

The filter cleaning device 28 is in particular designed so that it is the filter 22nd with purge air (external air) applied, and that this to loosen dirt particles from the filter 22nd leads.

In one embodiment it is provided that the filter cleaning device 28 is demand-driven. It is also a control device 30th intended. For example, it is determined by one or more pressure sensors when filter cleaning is necessary, and the control device then sends a corresponding detection result 30th a filter cleaning is carried out automatically. In this context, the WO 2015/139751 A1 referenced.

It is also possible that the control device 30th indicates the need for filter cleaning, and this must then be carried out manually by an operator.

In one embodiment, the vacuum cleaner 10 with a battery device 32 and in particular a rechargeable battery device 32 operated. It is provided in particular that the battery device 32 the necessary electrical energy for the suction unit 16 provides, and also the necessary electrical energy for the filter cleaning device 28 provides.

The filter cleaning device 28 is above the filter in one embodiment 22nd on the suction head 14th arranged. In principle it is also possible that the filter cleaning device 28 on the suction material container 12th is arranged.

In a first embodiment of a filter cleaning device, which is in the 2 and 3 and is designated there by 34, it is provided, for example, that the filter 22nd in the suction material container 12th protrudes.

The filter cleaning device 34 includes a vacuum chamber 36 , which is in fluid connection with the suction unit 16 stands ( 2 ).

The suction unit 16 generated in the area of the vacuum cleaner 10 a negative pressure, which in the negative pressure chamber 36 pending (in 2 indicated by the pressure p ₁ ).

The filter 22nd is between the vacuum chamber 36 and the suction material container 12th arranged. When operating the vacuum cleaner 10 prevails in the suction material container 12th also a negative pressure, which corresponds approximately to p ₁ (and usually due to the filter 22nd is greater than p ₁ ).

The vacuum cleaner 10 has an opening 38 at the vacuum chamber 36 to the filter 22nd on. About the opening 38 is the filter 22nd and thereby the suction material container 12th with the suction flow (in 2 by the reference number 40 indicated) acted upon. Through the opening 38 is (as will be explained later) the filter 22nd also with a purge air cleaning stream of the filter cleaning device 34 can be charged.

The filter cleaning device 34 includes a valve 42 with a closing body 44 .

In one embodiment, the closing body is 44 fixed on a spindle 46 arranged. The spindle 46 is in a height direction 48 movable. This is also the closing body 44 in this height direction 48 linearly movable.

The filter 22nd has on the clean side 26th an envelope 27 ( 2 ), which is in particular an envelope plane. The direction of altitude 48 is transverse and especially perpendicular to this envelope 27 .

The spindle 46 is on a first guide device 50 linearly displaceable. The first guide device 50 is immovable with respect to the vacuum chamber 36 .

It is also provided that the closing body on a second guide device 52 is displaceable and, for example, slidably guided. The second guide device is also non-displaceable with respect to the vacuum chamber 36 .

In one embodiment, the first guide device is 50 centrally arranged. The second guide device 52 is arranged peripherally.

The closing body has a first disk element 54 on. It also has a second disc element 56 on which one is in the height direction 48 spaced from the first disc element 54 is. Between the first disc element 54 and the second disc element 56 is a connection area 58 positioned.

The closing body 44 is in particular rotationally symmetrical to an axis of symmetry 60 which is parallel to the height direction 48 is. The axis of symmetry 60 is in particular a central axis, the first guide device 50 lies on this central axis.

In one embodiment, the first disc element 54 and the second disc element 56 each a circular circumference.

In one embodiment, the closing body is 44 designed in two parts. It is made of two parts that are connected to each other. The first disk element is on one part 54 formed and part of the connection area 58 , and on the second part is the second disc element 56 and part of the connection area 58 educated.

The first disc element 54 has a face end 62 . The second disc element 56 has a face end 64 . As mentioned above, the first are disc elements 54 and the second disc element 56 at their respective front ends 62 or. 64 circular.

The first disc element 54 is the filter 22nd facing. The second disc element 56 is the filter 22nd turned away. The first disc element 54 sits between the filter 22nd and the second disc element 56 .

The connection area 58 has an outer contour 66 , which opposite the front ends 62 , 64 is reset. This is between the first disc element 54 , the connection area 58 and the second disc element 56 a room 68 on the side of the closing body 44 educated.

This room 68 is in particular ring-shaped or ring-shaped surrounds the connection area 58 .

The space 68 is upwards through the second disc element 56 towers above, and downwards (towards the filter 22nd hin) through the first disc element 54 towers.

On the first disc element 54 is a first investment area 70 arranged or formed. On the second disc element 56 is a second investment area 72 arranged or formed.

The first investment area 70 is on the first disc element 54 repellent to the filter 22nd arranged. The second investment area 72 is on that second disc element 56 repellent from the filter 22nd arranged.

The filter cleaning device 34 includes a counter device 74 for the closing body 44 . The counter device 74 is at the vacuum chamber 36 arranged.

The counter device 74 is through a housing 76 educated.

The counter device 74 forms a valve seat or closing body seat.

The closing body 44 is in the case 76 movably arranged.

The counter device 74 comprises a first wall 78 . The first wall 78 protrudes into the room 68 around the connection area 58 of the closing body 44 . The first wall 78 is arranged stationary. The first disc element 54 and the second disc element 56 are relative to the first wall 78 movable.

On the first wall 78 is a first counter-investment area 80 for the first investment area 70 on the closing body 44 educated.

The first investment area 70 and the first counter-investment area 80 is a first sealing device 82 assigned. The first sealing device 82 is in particular in the form of a ring, which in particular is symmetrical about the axis of symmetry 60 is.

In one embodiment, the first sealing device is 82 on the closing body 44 arranged. It is alternatively possible that the corresponding sealing device on the counter device 74 and on the first wall 78 is positioned. Furthermore, it is possible that a sealing device is both on the counter device 74 as well as on the first disc element 54 of the closing body 44 is arranged.

The first sealing device 82 serves as a fluid seal when above the first contact area 70 the closing body 44 to the counterpart facility 74 to the first counter-investment area 80 is applied.

The counter device 74 further comprises a second wall 84 . The second wall 84 is in the height direction 48 spaced from the first wall 78 and is further away from the filter 22nd as the first wall 78 ; the first wall 78 lies between the second wall 84 and the filter 22nd based on the height direction 48 .

On the second wall 84 is a second counter-investment area 86 for the second investment area 72 on the second disc element 56 of the closing body 44 arranged or formed.

The second investment area 72 and the second counter-investment area 86 is a second sealing device 88 assigned. This is in particular in the form of a sealing ring.

The second sealing device 88 sits on the second disc element 56 (compare 2 ), or at the counter device 74 . It is also possible that the second sealing device 88 Has parts which both on the counter device 74 as well as on the closing body 44 sit.

The counter device 74 and the closing body 44 are designed to be adapted to one another that when the closing body 44 with the first investment area 70 the counter device 74 (at the first counter-investment area 80 ) contacted and a fluid tightness is achieved there, also the second contact area 72 the second counter-investment area 86 contacted and fluid tightness has also been achieved there ( 2 ).

When the first investment area 70 and the second investment area 72 of the closing body 44 at the counter device 74 then the valve is in place 72 in a closed position 90 ( 2 ).

Operational 10 the vacuum cleaner has a negative pressure area 92 on. The negative pressure area 92 is the area that is subjected to a suction flow. The filter 22nd is due to this negative pressure area 92 . An interior of the vacuum chamber 36 is due to the negative pressure area 92 .

When the suction unit 16 generates a suction flow, then prevails in the negative pressure area 92 a negative pressure compared to an outside space and in particular to atmospheric pressure. The negative pressure can be at different points in the negative pressure area 92 be different.

The vacuum cleaner 10 also has a normal pressure range 94 on. The normal pressure range 94 surrounds the vacuum chamber 36 and surrounds the filter cleaning device 34 . The valve 42 serves when it is in the closed position 90 is the normal pressure range 94 from the negative pressure area 92 to separate fluid-tight. In "normal" suction operation, a fluid-tight separation of the normal pressure area prevents 94 from the negative pressure area 92 Leakage currents.

To provide purge air for filter cleaning of the filter 22nd through the filter Cleaning device 34 is a fluid-active connection between the normal pressure range 94 and the negative pressure area 92 intended.

In the normal pressure range 94 there is a pressure p ₂ which is greater than the pressure p ₁ in the negative pressure range. In one embodiment, the pressure p _{2 is} approximately constant and is at the external atmospheric pressure.

It is also possible that the pressure p _{2 is} in the normal pressure range 94 is greater than atmospheric pressure. For example, one embodiment provides for a compressor to operate in the normal pressure range 94 applied and there is then a pressure p ₂ , which is above atmospheric pressure. Such an embodiment is used, for example, in a sweeper.

The closing body 44 points to the first disc element 54 and the second disc element 56 effective areas for pressurization.

In one embodiment (cf. 2 and 3 ) is the closing body 44 on the first disc element 54 and the second disc element 56 with respect to the pressure-effective surfaces formed in such a way that the closing body 44 in the closed position 90 due to the pressure difference between the normal pressure range 94 and the negative pressure area 92 in the closed position 90 is held. The second disc element 56 has a larger diameter than the first disk element 54 on. The front end 64 of the second disc element 56 is further spaced from the axis of symmetry 60 than the front end 62 of the first disc element 54 ; the front end 62 is opposite the front end 64 set back by a distance D (compare the reference symbol 96 in 2 ).

For example, the effective diameter of the second disk element for a seal is 56 by a factor greater than one to approximately 1.3 greater than the effective diameter of the first disk element 54 .

This difference in the design of the first disc element 54 and the second disc element 56 causes the force due to the pressure difference between the normal pressure range 94 and the negative pressure area 92 the closing body 44 against the opposing device 74 presses.

The case 76 the counterpart device 74 has an opening or has a plurality of openings 98 on what air (from the normal pressure range 94 ) into the housing 76 can flow in.

In particular, has an opening 98 a muzzle normal which is transverse and in particular perpendicular to the height direction 48 lies. In 2 is this muzzle normal with the reference number 100 indicated.

Starting from the opening or openings 98 has the housing 76 a room 101 on in which the closing body 44 is movable. This room 101 is with a corresponding space of the vacuum chamber 36 connected and is therefore also with the filter 22nd connected.

The filter cleaning device 34 has a magnetic device 102 on. This includes an (electro) magnet 104, which is controlled by the control device 30th is controlled.

The magnet 104 is central and in particular coaxial with the axis of symmetry 50 non-shifting with respect to the vacuum chamber 36 positioned.

At the spindle 46 sits an anchor 106 . The anchor 106 is also on the central axis 60 positioned.

The anchor 106 cooperates with the magnet 104 .

In the closed position 90 of the valve 42 the force caused by the pressure difference ensures that the closing body 44 at the counter device 74 is applied.

The magnet 104 is designed as a lifting magnet. The anchor 106 is for example a movable iron core.

By energizing the magnet 104 he exerts a force on the anchor 106 and thus the closing body 44 out. The closing body 44 can differ from the counterpart device 74 take off ( 3 ). The valve 42 will be opened; the valve 42 is in an open position 108 .

It is basically possible that the valve 42 based on the height direction 48 in the open position 108 can take different positions.

A maximum stroke of the closing body 44 starting from the closed position 90 is by a stop 110 at the first guide device 50 (or alternatively or additionally by a stop on the second guide device 52 specified).

Starting from the closed position 90 the closing body moves 44 when opening the Valve 42 in one direction 112 (compare 2 ) on the at least one filter 22nd to.

From the open position 108 the closing body moves 44 to reach the closed position 90 in one direction 114 (compare 3 ) which is the opposite direction to the direction 112 is, and which from the filter 22nd is away.

The closing body can be controlled by appropriate activation (energization) of the (electro) magnet 104 44 from the counterpart device 74 lift off to generate a controlled purge air cleaning stream.

In particular, the closing body 44 via a spring device 116 supported. The spring device 116 is arranged in such a way that it tends to exert a force which acts as a restoring force and which in the direction 114 works. In particular, the spring device 116 compressed when the closing body 44 from the closed position 90 in the open position 108 is brought. This requires an external force, which is applied via the magnet 104 on the anchor 106 is exercised. When this force, the corresponding force of the spring device 116 predominates, is no longer available, then brings the spring device 116 (in addition to the existing pressure difference) the closing body 44 again to the closed position 90 by putting this in the direction of 114 emotional. The force of the spring device 116 So works in that direction 114 .

In one embodiment, the counter device 74 a central opening 118 around the axis of symmetry 60 on. Above this opening 118 is the magnet 104 positioned. In the opening 118 is at least partially the anchor 106 positioned.

Between the anchor 106 or the spindle 46 and the magnet 104 is a sealing sleeve 120 positioned, which increases the mobility of the anchor 106 allows (to transition between the closed position 90 and the open position 108 and vice versa between the open position 108 and the closed position 90 to enable, and thereby a fluid-tight sealing of the room 101 opposite the magnet 104 to obtain.

The filter cleaning device 28 comprises (at least) a first channel 122 and one from the first channel 122 separate second channel 124 for purge air.

The first channel 122 includes a first area 126 (compare 3 ), which is transverse to the height direction 48 is oriented. Purge air that is in the first area 126 flows, has a main flow direction which is at least approximately transverse to the vertical direction 28 is oriented. The first area 126 goes out from the opening 98 in the case 76 . The first area 126 has a ring shape.

The first area 126 is between an upper side of the closing body 44 and thereby between the second disc element 56 and the second wall 84 educated.

To the first area 126 a diversion area closes 128 at. This diversion area 128 serves to deflect the flow. To the diversion area 128 a second area closes 130 of the first channel 122 at. This second area 130 of the first channel 122 is through the closing body 44 through and thereby through the first disc element 54 , the connection area 58 and the second disc element 56 passed through and it opens into the vacuum chamber 36 .

A main flow direction in the second area 130 of the first channel 122 is at least approximately parallel to the height direction 48 .

The second area 130 is at least partially through the second wall 84 limited, the second wall 84 is in particular arcuate and has a region which is at least approximately parallel to the height direction 48 lies.

In the closed position 90 of the valve 42 is the first channel 122 on the input side to the normal pressure range 94 closed. The first area 126 is opposite the normal pressure range 94 closed (compare 2 ). It is sealed fluid-tight so that it is in the closed position 90 of the valve due to the installation of the second contact area 72 to the second counter-investment area 86 on the input side in the first channel 122 starting from a normal pressure range 94 no air can flow in.

The first channel 122 is with its second area 130 permanently effective fluid with the vacuum chamber 36 connected, i.e. it is permanently connected to the vacuum chamber on the output side 36 connected.

The second channel 124 has a first area 132 on (compare 2 and 3 ), which is transverse to the height direction 48 is oriented. When scavenging air flows in the first area 132 of the second channel 124 a main flow direction in the first region lies transversely to the height direction 48 .

The first area 132 forms an entrance to the second channel 124 out. About the first area 132 is the second channel 124 always on the inlet side with the normal pressure range 94 (compare the 2 and 3 ) connected.

The first area 132 of the second channel 124 is between the first wall 78 and the second disc element 56 educated.

To the first area 132 a diversion area closes 134 at. This diversion area 134 comprises a second area in which at least approximately one main flow direction is parallel to the height direction 48 is.

To the diversion area 134 closes another first area 136 which is also transverse to the height direction 48 is oriented. The other first area 136 another second area closes 138 which is at least approximately parallel to the height direction 48 is oriented. In the further second area 138 is a main flow direction at least approximately parallel to the height direction 48 . The other second area 138 of the second channel 124 opens into the vacuum chamber 36 .

The second channel 124 opens into the normal pressure range on the inlet side 94 and on the outlet side into the vacuum chamber 36 and thereby into the negative pressure area 92 .

The second channel 124 is about the first area 132 permanently with the normal pressure range 94 connected, that is, is both in the closed position 90 of the valve 42 as well as in the open position 108 of the valve 42 with the normal pressure range 94 connected (compare the 2 and 3 ).

The second channel 124 is about its further second area 138 on the outlet side only in the open position 108 of the valve 42 with the negative pressure area 92 (and the vacuum chamber 36 ) fluidly connected. In the closed position 90 is by creating the first investment area 70 to the first counter-investment area 80 the second channel 124 fluid-tight compared to the negative pressure area 92 closed.

The first channel 122 and the second channel 124 are ring-shaped. In particular, for each cross section, the height direction is related 48 the first channel 122 or the second channel 124 annular.

With the first channel 122 can be in the open position 108 of the valve 42 Purge air in a first partial flow 140 (compare 3 ) through the closing body 44 through and through an opening 142 in the closing body through the filter 22nd respectively.

Through the second channel 124 can be a second partial flow 144 of purge air on the closing body 44 sideways past and outside of the connection area 58 along the outer contour 66 pass it and the filter 22nd respectively.

Between the second wall 84 and the first wall 78 is a first room 85 educated. In this first room 85 is the second disc element 56 of the closing body 44 movable. There is another wall 87 , which between the first wall 78 and the filter 22nd lies. The further wall 87 can also be part of the vacuum chamber 36 be. Between the first wall 78 and the further wall 87 is in the second room 89 educated. In this second room 89 is the first disc element 54 movable.

• In einem Saugbetrieb des Staubsaugers 10 erzeugt das Saugaggregat 16 einen Saugstrom. In dem Unterdruckbereich 92 liegt gegenüber dem Normaldruckbereich 94 ein Unterdruck vor. In einem Normalbetrieb ist das Ventil 42 geschlossen; es liegt in der geschlossenen Stellung 90 vor. Die Anlagebereiche 70, 72 liegen an der Gegeneinrichtung 74. Die Unterdruckkammer 36 ist dadurch gegenüber dem Normaldruckbereich 94 fluiddicht geschlossen.

The filter cleaning device 34 works like this:

• In a suction mode of the vacuum cleaner 10 generates the suction unit 16 a suction flow. In the negative pressure area 92 is opposite the normal pressure range 94 a negative pressure. The valve is in normal operation 42 closed; it is in the closed position 90 in front. The investment areas 70 , 72 are due to the counter device 74 . The vacuum chamber 36 is compared to the normal pressure range 94 closed fluid-tight.

When a filter cleaning process is initiated, the closing body 44 emotional.

It becomes the magnet for this 104 correspondingly energized (activated by the control device 30th ). This causes the armature to move 106 and the closing body is lifted off 44 from the counterpart device 74 .

It becomes the first channel 122 open on the input side and the second channel 124 is opened on the output side.

Due to the pressure difference between the normal pressure range 94 and the negative pressure area 92 the first partial stream flow 140 and the second substream 144 . The two partial flows 140 , 144 are ring-shaped.

The first substream 140 flows through the closing body 44 . The second substream 144 flows around the closing body 44 .

A corresponding flushing flow flows into the vacuum chamber 36 and flows from (through) the vacuum chamber to the filter 22nd .

A cleaning stream is created, which the filter 22nd applied ( 3 ; the cleaning stream is denoted by the reference symbol 146 indicated). The filter 22nd is flushed by the corresponding flushing flow. Adhering dirt particles can loosen and enter the suction material container 12th fall.

The filter cleaning takes place in such a way that on the vacuum chamber 36 still the suction flow of the suction unit 16 is applied.

The solution according to the invention is in the closed position 90 the seal against the normal pressure range 94 through the closing body 94 on (at least) two levels above the first investment area 70 and the second investment area 72 reached. The first investment area 70 and the second investment area 72 are in the closed position 90 effective at the same time. The first investment area 70 and the second investment area 72 are offset in the height direction 48 .

When the closing body 44 from the closed position 90 is raised, mouth openings on the first channel 122 and the second channel 124 released through which purge air (external air) can flow. A radial opening area increases with the valve lift.

Purge air then flows to the first contact area 70 and the second investment area 72 to the filter 22nd . Correspondingly, scavenging air also flows in the first opposing contact area 80 and the second counter-investment area 86 over to the filter 22nd .

At the filter cleaning device 34 is an effective sealing diameter of the closing body 44 on the first disc element 54 and the second disc element 56 different, so that there is a different pressure effect. In this embodiment, this is dimensioned such that the closing body 44 due to the pressure difference between the negative pressure area 92 and the normal pressure range 94 without external force of the closing body 44 in the closed position 90 is held.

When the closing body 44 from the closed position 90 is lifted, then the fluid-tight seal on the first contact area is approximately simultaneously 70 and the second investment area 72 canceled.

When opening the valve 72 a large air cross-section can be used for scavenging air to flow to the filter 22nd to reach. A relatively large air cross-section can quickly be achieved when opening.

In 4th is schematically in a solid line a time course of a volume of cleaning air over the filter 22nd shown in the solution according to the invention. It can be seen that within a relatively short time there is a rapid increase and then a relatively high level is reached. The measurement was made in connection with a suction material container 20th carried out with an intake volume of 20 l.

In comparison, the corresponding course for a conventional filter cleaning device is shown in broken lines, as shown in FIG DE 10 2010 029 518 A1 is described.

One recognizes the course in the solution according to the invention 148 compared to the course 150 the faster ascent and the higher plateau 152 .

The steeper course 158 is on faster opening of the valve 42 traced back. A higher level 152 stands for a larger amount of purging air (external air than cleaning air).

In the solution according to the invention, the height-offset contact areas 70 , 72 when opening the valve 42 an annular gap opening reached on different levels and with a large diameter. As mentioned, the opening cross-section increases with the valve lift. For example, a pulse in the order of 90 ms opens on the magnet 104 (Solenoids) the valve 42 .

It is basically possible for an additional energy storage spring 154 (compare 3 ) is provided, which for example on the first guide device 50 is arranged, and which serves to increase the opening speed. A force of the energy storage spring 154 strives to the closing body 44 from the counterpart device 74 take off. The energy storage spring 154 must be dimensioned accordingly, taking into account the spring device 116 and the compressive force which the closing body 44 at the counter device 74 in the closed position 90 holds.

It has been shown that with the filter cleaning device according to the invention 34 there is a relatively low level of noise in terms of popping noises. It has been compared with a filter cleaning device such as that in the DE 10 2010 029 518 A1 is described, result in a reduction of popping noises by approx. 3.6 dB (A) or more.

An effective filter cleaning can be achieved with the filter cleaning device 34 achieve, even if the suction fan is designed to be weaker, such as with a vacuum cleaner 10 , which with a battery device 32 is operated.

In one embodiment it is provided that the magnet 104 is controlled periodically. For example, every 15 s three closely consecutive opening pulses with a duration of approx. 90 ms or 100 ms are emitted.

In one embodiment it is provided that the first contact area 70 on the first disc element 54 is about 115 mm in diameter. The second investment area 72 on the second disc element 56 has a diameter of approx. 120 mm.

One stroke of the valve 42 and thus a stroke of the closing body 44 in the height direction 48 starting from the closed position 90 is in particular at least 5 mm. The stroke is preferably at most 50 mm.

In a specific embodiment, the valve lift is in the range between 10 mm and 20 mm.

It is provided that the distance between the first contact area 70 and the second investment area 72 in the height direction 48 is at least 6 mm and preferably at least 10 mm. In a specific embodiment, this axial distance is 30 mm.

A diameter is preferably at the second contact area 72 at least 50 mm. The seal diameter at the first contact area 70 is a maximum of 200 mm.

Another embodiment of a filter cleaning device, which is in the 5 6 (with the valve closed) and 6 (with the valve open) and denoted by 156 comprises a closing body 158 with a first disc element 160 , a second disc element 162 and a connection area 164 between the first disc element 160 and the second disc element 162 . As with the closing body 44 is on the first disc element 160 a first contact area is arranged and on the second disk element 162 a second investment area.

The closing body 158 differs from the closing body 44 in that there is an effective pressure area on the first disc element 160 is larger than on the second disc element 162 ; with respect to the first contact area, the first disk element 160 a larger diameter than the second disc element 162 .

For example, is the effective diameter of the second disk element 162 smaller by a factor of up to 0.7 than the effective diameter of the first disk element 160 .

The counter device is basically designed the same as the counter device 74 . The same reference number is therefore used.

This acts in a closed position 165 ( 5 ) of a corresponding valve 166 with the closing body 158 when the contact areas of the closing body 158 at the counter device 74 lie, a force on the closing body 158 which endeavors this in the direction of the filter 22nd to move. The corresponding direction of action is in 2 by the arrows with the reference number 168 indicated.

To the valve 166 in the closed position 165 to hold is a holding device 170 necessary. The holding device 170 is as a magnetic device 172 educated. This magnetic device 172 has a holding magnet 174 on, which is in particular an electromagnet. The holding magnet 174 is fixed with a vacuum chamber 36 connected. Regarding the holding magnet 174 is the closing body 158 movable.

The holding magnet 174 is in particular by the control device 30th controlled.

The valve 166 has a spindle 176 on which a magnetic holding plate 178 sits. In the closed position 156 of the valve 166 is the holding magnet 174 energized in such a way that it exerts a magnetic force on the holding plate 178 and with it the spindle 176 with the closing body 158 exercises. The closed position 165 of the valve 166 is thereby fixed.

To open the valve 166 and transition to an open position 180 ( 6th ) is the application of current to the holding magnet 174 changed so that the magnetic force of the holding magnet 174 is no longer sufficient, the closing body 158 with the retaining plate 178 in the closed position 165 to keep. Due to the pressure difference between the negative pressure area 92 and the normal pressure range 94 goes the valve 166 on and the contact areas of the closing body 158 are from the counterpart device 74 lifted. It can then flush air as above using the filter cleaning device 34 described about the filter 22nd reach.

The filter cleaning device works in this regard 156 same as the filter cleaning device 34 .

The filter cleaning device 156 can be used as a kind of kinematic reversal of the filter cleaning device 34 be considered. At the filter cleaning device 34 causes the pressure difference between the negative pressure area 92 and the normal pressure range 94 a holding of the closing body 44 in the closed position 90 .

At the filter cleaning device 156 is due to the corresponding design of the closing body 158 a holding force is necessary to the closing body 158 at the counter device 74 in the closed position 165 to keep.

At the filter cleaning device 34 practice to reach the open position 108 of the valve 42 the magnetic device 102 with the lifting magnet 104 a corresponding force on the closing body 44 out to this in the direction of the filter 22nd to move while keeping the open position 108 to reach.

At the filter cleaning device 156 becomes the closing body when the holding force is eliminated (or reduced) by the holding magnet174 158 due to the pressure difference in the open position 108 towards the filter 22nd too moved.

It is basically also possible that the holding magnet 174 in cooperation with the retaining plate 178 is designed so that it is the closed position in a de-energized state 165 holds, and when current is applied the holding force is reduced to the valve 166 from the closed position 165 move out.

At the filter cleaning device 156 is in the closed position 165 also a plant of the closing body 158 at the counter device 74 achieved on at least two levels.

When the valve is opened 166 In principle, a similar or the same flow pattern is formed as with the filter cleaning device 34 with the advantages explained there.

The filter cleaning device 156 includes in particular a spring device 181, which acts as a return spring device and strives to the valve 166 from the open position 180 in the closed position 165 bring to.

Another embodiment of a filter cleaning device according to the invention 182 which is in 7th (in the closed position of a valve) and 8th (in an open position of the valve) is shown schematically, comprises a counter device 184 with a housing 186 .

In the case 186 is a closing body 188 slidably guided. The closing body 188 comprises a first disc element 190 with a first investment area 192 . It also includes a second disk element 194 with a second investment area 196 . Between the first disc element 190 and the second disc element 194 is a connection area 198 positioned. The counter device 184 has a first wall 200 on. This has a first counter-investment area for the first investment area 192 .

The counter device also has a second wall 202 , which has a counter-investment area for the second investment area 196 having.

The first wall 200 and the second wall 202 are in one height direction 204 spaced from each other. The first investment area 192 and the second investment area 196 on the closing body 188 are also in the height direction 204 at a distance from one another, as in the case of the filter cleaning device 34 or 156 .

The case 166 has a third wall 206 on. Between the third wall 206 and the second wall 202 is a room 208 educated.

Between the second wall 202 and the third wall 206 as a further wall is a first room 207 educated. In this first room 207 is the second disc element 194 movable.

Between the first wall 200 and the second wall 202 is a second room 209 educated. In this is the first disc element 190 movable.

One valve 210 with the closing body 188 can be moved with respect to the counter device 184 . Starting from a closed position 212 of the valve 210 ( 7th ), in which the closing body 188 with its investment areas 192 , 196 at the counter device 184 is applied, is the closing body 188 in one direction 214 from the valve 22nd movable away.

The filter cleaning device 182 has a first channel 216 and a second channel 218 on.

In the closed position 212 of the valve 210 ( 7th ) are the first channel 216 and the second channel 218 compared to a normal pressure range 94 closed fluid-tight.

With a valve lift ( 8th ) where the valve 210 in an open position 220 are the first channel 216 and the second channel 218 on the input side to the normal pressure range 94 open.

Purge air can then flow in and to the filter 22nd stream (into the 7th , 8th the filter is not shown; its location is indicated by the reference number 22nd indicated).

The first channel 216 has a first area 222 at which there is an entrance. This can be used in the open position 220 Air flow in. A partial flow of air flows to an outer contour of the closing body 188 passes and flows in the housing 186 between an upper side of the closing body 188 and the third wall 206 . The partial flow is deflected and then flows through the closing body 188 through to the filter 22nd .

Another partial stream 224 flows over a first area of the second channel 218 and is diverted to the filter 22nd down.

In one embodiment, the first disc element 190 based on the first investment area 192 a larger diameter than the second disc element 194 with regard to a second investment area 196 .

This means that due to the pressure difference between the normal pressure range 94 and a negative pressure area 92 the closing body 188 to the counterpart facility 184 is pressed and the closed position 212 is secured.

To the valve 210 from the closed position 212 an external force is required to bring it.

For this purpose, there is a magnetic device corresponding to the magnetic device 102 provided (the same reference numerals are used for the same elements). This includes a lifting magnet 104 which is on a corresponding anchor 106 works.

The first investment area 192 and the second investment area 196 on the closing body 188 are the filter 22nd facing, i.e. pointing in a direction opposite to the direction 214 .

At the filter cleaning device 182 there is a transition from the closed position 12th in the open position 220 by a movement of the closing body 188 from the filter 22nd away and thus to a certain extent upwards.

With the filter cleaning devices 34 and 156 the corresponding valve opens 42 or. 166 due to a movement of the respective closing body 44 or. 158 on the filter 22nd to.

Another embodiment of a filter cleaning device, which is in the 9 and 10 and indicated at 226, wherein in FIG 9 a closed position of a valve 228 is shown, and in 10 an open position of the valve 228 shown comprises a closing body 230 . A counter device is provided which is basically designed in the same way as the counter device 184 . For the same elements as the filter cleaning device 182 the same reference numerals are used.

The closing body 230 is designed so that it is with respect to a second contact area 232 has a larger effective pressure diameter than for a first contact area 234 .

The pressure difference between a normal pressure range 94 and a negative pressure area 92 causes the closing body to move away from its contact with the counter-device 184 .

To the closed position according to 9 to be held, a holding force is therefore necessary. For example, a magnetic device corresponding to the magnetic device is used for this purpose 172 with a holding magnet 174 used. For the same elements as the filter cleaning device 56 the same reference numerals are used.

The filter cleaning device works in this regard 226 same as the filter cleaning device 156 . Like the filter cleaning device 156 a kind of kinematic reversal of the filter cleaning device 34 represents the filter cleaning device 226 a kind of kinematic reversal of the filter cleaning device 182 represent.

With the filter cleaning devices 182 and 226 there is a transition from the closed position 212 in the open position 220 by moving away the corresponding closing body 188 or. 230 from the filter 22nd away upwards, so to speak.

It can in turn, as with the filter cleaning devices 34 and 156 generate a cleaning current with a steep rise and a high level (cf. 4th ) is achieved and thereby effective cleaning is achieved.

Another embodiment of a filter cleaning device according to the invention, which is shown in 11 shown schematically and indicated at 236, being an open position 238 of a valve 240 with a closing body 242 is shown, is designed the same as the filter cleaning device with regard to the design of the closing body and the flow guide 34 .

The filter cleaning device 236 is intended for manual operation. It includes a hand-operated actuator 244 . This hand-operated actuator is with a spindle 246 connected. The Hand actuator 244 is with the closing body 242 connected.

On the hand actuator 244 an operator can access it directly, or a corresponding conversion mechanism is provided via which a manual actuation by an operator on the manual actuation element 244 is forwarded.

The closing body 242 is via a first guide device 248 , which is central, and a second guide device, which is peripheral, on an opposing device 252 for the closing body 242 slidably guided.

By pressing the hand control 244 in one direction 254 on the filter 22nd to becomes the closing body 242 lifted, in the same way as above for the filter cleaning device 34 based on the closing body 44 described. (At the filter cleaning device 34 the lifting occurs due to the lifting magnet 104 .)

A spring device 256 ensures a reset of the closing body 242 into its closed position, from which the operation with the hand-operated operating element starts 244 he follows.

The closing body 242 is designed like the closing body 44 at the filter cleaning device 34 . This means that the valve is in a closed position 240 secured by the pressure difference between a normal pressure area and a negative pressure area. An external force is necessary to make the closing body contact 242 at the counter device 252 to pick up, that is, to the valve 240 to lift from a closed position.

It is basically possible that the hand-operated actuating element 244 is designed as an actuating button and a spring device 258 is provided, which is designed in particular as an energy store. The spring device mentioned above 256 ensures a reset of the manual operating element 244 .

The filter cleaning device works with regard to the flow guidance 236 like the filter cleaning device 34 .

In a sixth embodiment of a filter cleaning device, which is in the 12th and 13th and is designated there by 260, wherein in 12th a closed position 262 and in 13th an open position 264 of a valve 266 shown sits on the valve 266 a closing body 268 . The closing body 268 is in a housing 270 a counter device 272 guided. He is in one height direction 274 movable.

The closing body 268 has a first investment area 276 on a first wall 278 the counterpart device 272 . The first investment area 276 has a first sub-investment area 276a and a second sub-investment area 276b on. The first sub-investment area 276a and the second sub-investment area 276b are in a radial direction perpendicular to the height direction 274 spaced from each other. In particular, they are ring-shaped and concentric to one another. In particular, is the first sub-investment area 276a an outer area which closes the second sub-investment area 276b surrounds.

Furthermore, is on the closing body 268 at a distance from the first contact area in the height direction 276 a second investment area 280 educated. This has a first sub-investment area 280a and a second sub-investment area 280b on.

These sub-investment areas 280a and 280b are in particular ring-shaped and concentric to one another.

The sub-investment areas 280a , 280b are radially spaced from one another, that is, they are in a direction perpendicular to the height direction 264 spaced from each other.

The counter device 272 has corresponding counter-investment areas.

In the closing body 268 is between the first sub-investment area 276a and the second sub-investment area 276b of the first investment area 276 on the one hand, and the first sub-investment area 280a and the second sub-investment area 280b of the second investment area 280 a continuous and in particular annular opening 282 educated. This forms parts of a channel.

The second investment area 280 is used to plant on a second wall 284 the counterpart device 272 in the closed position 262 .

Between the second wall 284 and the first wall 278 is a side opening 286 educated.

There is also an annular opening 288 on the second wall 284 the second sub-investment area 280b assigned formed.

When the valve is lifted 296 from the open position 264 (compare 13th ) can be from a normal pressure range 94 Purge air through the opening 286 flow in and thereby through the opening 282 of the closing body 268 stream. Furthermore, purge air can through the opening 286 flow in and through the opening 282 of the closing body 268 stream.

It forms over the closing body 268 a first substream 290 and a second substream 292 off (compare 13th ). It's a first channel 294 formed, which has a first entrance 296 and a second entrance 298 having.

There is also a second channel 300 formed, which is basically the second channel 124 at the filter cleaning device 34 corresponds.

The first channel 294 is T-shaped in the area of the second wall 284 with a transverse area at which the first entrance 296 and the second entrance 298 lie.

The transverse area of the first channel 294 between the first entrance 296 and the second entrance 298 has a collection area 300 on. In this are the first substream 290 and the second substream 292 run together and flow through the opening 282 on. In particular, is the collection area 300 above the opening 282 . Below the collection area 300 a merging stream flows as the merging of the first partial stream 290 and the second substream 292 through the opening 282 in the closing body 268 .

When the valve is opened 266 can then the first partial flow 290 starting from the first entrance 296 flow radially inward and then through the closing body 268 stream. The second substream 292 which through the second entrance 292 enters, can flow radially outward and then through the opening 282 and thereby through the closing body 268 the filter 22nd flow in.

Otherwise the filter cleaning device works 260 same as the filter cleaning device 34 .

According to the invention, a filter cleaning device is provided which, in the closed position, has contact areas (sealing areas) on different levels.

When a corresponding valve is opened, rinsing air (external air) for filter cleaning can flow in at different levels from a normal pressure area. Separate partial flows can be combined, which then use the filter 22nd for an effective cleaning.

This results in large radial cross-sections for an inflowing scavenging air. The corresponding closing body is both flowed through and around the scavenging air in partial flows.

In this way, a volume of rinsing air for cleaning the filter can be achieved which reaches a high level in terms of the amount of cleaning air within a short time. The corresponding valve can be opened quickly.

A filter cleaning device according to the invention can be used in a stand-alone vacuum cleaner as described above. It can also be used, for example, in a suction device that is installed in a vehicle such as a self-propelled floor cleaning machine (such as a sweeper 10 ) is integrated. It can also be used in a vacuum robot, for example.

List of reference symbols

10

vacuum cleaner

12

Suction material container

14th

Suction head

16

Suction unit

18th

connection

20th

Suction hose

22nd

filter

24

Dirty side

26th

Clean side

27

Enveloping

28

Filter cleaning device

30th

Control device

32

Battery device

34

Filter cleaning device (first embodiment)

36

Vacuum chamber

38

opening

40

Suction flow

42

Valve

44

Closing body

46

spindle

48

Height direction

50

First guide facility

52

Second guide device

54

First disc element

56

Second disc element

58

Connection area

60

Axis of symmetry

62

Front end

64

Front end

66

Outer contour

68

room

70

First investment area

72

Second investment area

74

Counter device

76

casing

78

First wall

80

First counter-investment area

82

First sealing device

84

Second wall

85

First room

86

Second counter-investment area

87

Further wall

88

Second sealing device

89

Second room

90

Closed position

92

Vacuum area

94

Normal pressure range

96

distance

98

opening

100

Muzzle standards

101

room

102

Magnetic device

104

magnet

106

anchor

108

Open position

110

attack

112

direction

114

direction

116

Spring device

118

opening

120

Sealing collar

122

First channel

124

Second channel

126

First area

128

Diversion area

130

Second area

132

First area

134

Diversion area

136

Another first area

138

Another second area

140

First partial flow

142

opening

144

Second partial stream

146

Cleaning stream

148

course

150

course

152

level

154

Energy storage spring

156

Filter cleaning device (second embodiment)

158

Closing body

160

First disc element

162

Second disc element

164

Connection area

165

Closed position

166

Valve

168

direction

170

Holding device

172

Magnetic device

174

Holding magnet

176

spindle

178

Retaining plate

180

Open position

182

Filter cleaning device (third embodiment)

184

Counter device

186

casing

188

Closing body

190

First disc element

192

First investment area

194

Second disc element

196

Second investment area

198

Connection area

200

First wall

202

Second wall

204

Height direction

206

Third wall

207

First room

208

room

209

Second room

210

Valve

212

Closed position

214

direction

216

First channel

218

Second channel

220

Open position

222

First area

224

Another partial flow

226

Filter cleaning device (fourth embodiment)

228

Valve

230

Closing body

232

Second investment area

234

First investment area

236

Filter cleaning device (fifth embodiment)

238

Open position

240

Valve

242

Closing body

244

Hand actuator

246

spindle

248

First guide facility

250

Second guide device

252

Counter device

254

direction

256

Spring device

258

Spring device

260

Filter cleaning device (sixth embodiment)

262

Closed position

264

Open position

266

Valve

268

Closing body

270

casing

272

Counter device

274

Height direction

276

First investment area

276a

First sub-investment area

276b

Second sub-investment area

278

First wall

280

Second investment area

280a

First sub-investment area

280b

Second sub-investment area

282

opening

284

Second wall

286

Side opening

288

opening

290

First partial flow

292

Second partial stream

294

First channel

296

First entrance

298

Second entrance

300

Collection area

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2451332 B1 [0003, 0083]
• DE 102010029518 A1 [0004, 0215, 0220]
• DE 102010029524 A1 [0005]
• EP 2672871 B1 [0006]
• WO 2014/173481 A1 [0007]
• DE 102011015074 A1 [0008]
• DE 102016125385 A1 [0009]
• EP 3120744 B1 [0010]
• DE 102013108559 A1 [0011]
• DE 202010012821 U1 [0012]
• DE 10101219 C9 [0013]
• US 2005/0011036 A1 [0014]
• DE 102005017702 A1 [0015]
• EP 2347690 B1 [0016]
• CN 101484060 B [0017]
• WO 2019/011429 A1 [0107]
• WO 2015/139751 A1 [0110]

Claims (54)

Suction device, comprising a suction unit (16) for generating a suction flow (40), at least one filter (22), and a filter cleaning device (28; 34; 156; 182; 226; 236; 260), the filter cleaning device ( 28; 34; 156; 182; 226; 236; 260) at least one valve (42; 166; 210; 228; 240; 266) with a movable closing body (44; 158; 188; 230; 268) and a counter device (74 ; 184; 252; 272) for the closing body (44; 158; 188; 230; 268), and wherein in an open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240 ; 266) the at least one filter (22) is acted upon by a cleaning flow and the cleaning flow is inactive in a closed position (90; 165; 212; 262) of the at least one valve (42; 166; 210; 228; 240; 266) or is characterized in that the closing body (44; 158; 188; 230; 268) has at least one first contact area (70; 192; 234; 276) on the counter device (74; 184; 252; 27 2) and a second contact area (72; 196; 232; 280) to the mating device (74; 184; 252; 272), the second contact area (72; 196; 232; 280) in a height direction (48; 204) spaced from the first contact area (70; 192; 234; 276) ) is that in the closed position (90; 165; 212; 262) of the at least one valve (42; 166; 210; 228; 240; 266) both the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) rest on the counter device (74; 184; 252; 272), and that in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228 ; 240; 266) both the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) are spaced apart from the counter device (74; 184; 252; 272), wherein in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) a purge air flow both at the first contact area (70; 192; 234; 276) and at the second contact area (72 ; 196; 232; 280) past z u flows through the filter (22). Suction device according to Claim 1 , characterized by a negative pressure area (92) in a suction mode, on which the at least one filter (22) is arranged, and a normal pressure area (94), on which the counter device (74; 184; 252; 272) is arranged, wherein in the closed position (90; 165; 212; 262) of the at least one valve (42; 166; 210; 228; 240; 266) the normal pressure area (94) is separated from the negative pressure area (92) in a fluid-tight manner, and in the open position (108 ; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) the normal pressure area (94) and the negative pressure area (92) are fluidly connected to one another by a channel device (122, 124). Suction device according to Claim 2 , characterized in that the cleaning stream by bringing the at least one valve (42; 166; 210; 228; 240; 266) from the closed position (90; 165; 212; 262) into the open position (108; 180; 238) is or will be generated. Suction device according to Claim 2 or 3 , characterized in that the channel device (122, 124) opens on the inlet side into the normal pressure region (94) and on the outlet side into the negative pressure region (92). Suction device according to one of the Claims 2 to 4th , characterized in that an inlet cross-section for air into the duct device (122, 124) increases steadily with a valve stroke when the closing body (44; 158; 188; 230; 268) is lifted from the counter device (74; 184; 252; 272) . Suction device according to one of the preceding claims, characterized in that the cleaning flow is or is generated while the suction unit (16) acts on the at least one filter (22) with a suction flow (40). Suction device according to one of the preceding claims, characterized by at least one of the following: the height direction (48; 204) is parallel to a direction of movement and in particular the direction of displacement of the closing body (44; 158; 188; 230; 268); - The height direction (48; 204) is parallel to a main flow direction of a suction flow when it flows through the at least one filter (22) in suction mode; - The height direction (48; 204) is parallel to a main flow direction of the cleaning flow when it flows through the at least one filter (22); - The height direction (48; 204) is transverse and in particular perpendicular to an envelope surface of the at least one filter (22) on a clean side (26); - The height direction (48; 204) is parallel to an axis of symmetry of the at least one valve (42; 166; 210; 228; 240; 266). Suction device according to one of the preceding claims, characterized in that the counter-device (74; 184; 252; 272) has a first counter-contact area (80) for the first contact area (70; 192; 234; 276) and a second counter-contact area ( 86) for the second contact area (72; 196; 232; 280), the second counter contact area (86) and the first counter contact area (80) being spaced from one another in the vertical direction (48; 204). Suction device according to one of the preceding claims, characterized in that the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) each have a sealing device (82; 88), in particular in the form of a sealing ring is assigned, and in particular characterized by at least one of the following: - the sealing device (82; 88) is arranged on the closing body (44; 158; 188; 230; 268); - The sealing device is arranged on the counter device (74; 184; 252; 272). Suction device according to one of the preceding claims, characterized in that the counter device (74; 184) has a housing (76; 186) in which the closing body (44; 188) is movably arranged and which has a through-flow space for scavenging air. Suction device according to one of the preceding claims, characterized in that a clean side (26) of the at least one filter (22) is located on a vacuum chamber (36), in particular with at least one of the following: - the vacuum chamber (36) is connected to the suction unit (16 ) connected; - In a suction mode of the suction device, the negative pressure chamber (36) is permanently fluidly connected to the suction unit (16); - At least one channel (122; 124) of the filter cleaning device (34) opens into the vacuum chamber (36) for air supply to the at least one filter (22) in a cleaning operation; - The counter device (74) is arranged on the vacuum chamber (36); - The at least one valve (42) separates the vacuum chamber (36) in a closed position (90) of the at least one valve (42) in a fluid-tight manner from a normal pressure area (94). Suction device according to one of the preceding claims, characterized in that the at least one valve (42; 166; 210; 228; 240; 266) and / or the closing body (44; 158; 188; 230; 268) is rotationally symmetrical to an axis of symmetry , wherein in particular the axis of symmetry is parallel to the height direction (48; 204). Suction device according to the preamble of Claim 1 or according to one of the preceding claims, characterized in that the closing body (44; 158; 188; 230; 268) and the counter device (74; 184; 252; 272) are adapted to one another in such a way that in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) a plurality of separate air partial flows (140; 144) on the filter cleaning device (28; 34; 156; 182; 226; 236; 260 ) flows, and in particular a first partial flow (140) past the closing body (44; 158; 188; 230; 268) on the outside and a second partial flow (144) through the closing body (44; 158; 188; 230; 268) to the at least one filter (22) flows. Suction device according to the preamble of Claim 1 or according to one of the preceding claims, characterized in that the filter cleaning device (28; 34; 156; 182; 226; 236; 260) in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) has at least one first channel (122) for a first partial flow (140) and a second channel (124) for a second partial flow (144), the second channel (124) being separate from the first channel (122) is. Suction device according to Claim 14 , characterized by at least one of the following: - the first channel (122) opens on the inlet side into a normal pressure region (94); - The second channel (124) opens on the inlet side into the normal pressure area (94); - The first channel (122) opens on the outlet side into a negative pressure region (92); - The second channel (124) opens on the outlet side into the negative pressure region (92); - In the closed position (90) of the at least one valve (42), the first channel (122) is closed on the inlet side to the normal pressure region (94); - In the open position (108) of the at least one valve (42), the first channel (122) is open on the inlet side to the normal pressure region (94); - The first channel (122) is permanently fluidly connected to the negative pressure area (92) on the output side; - In the closed position (90) of the at least one valve (42), the second channel (124) is closed on the outlet side to the negative pressure region (92); - In the open position (108) of the at least one valve (42), the second channel (124) is open on the outlet side to the negative pressure region (92); - The inlet side of the second channel (124) is permanently connected to the normal pressure area (94) in a fluidically effective manner. Suction device according to Claim 14 or 15th , characterized in that the first channel (122) runs at least in part through the closing body (44), and in particular that the first channel (122) is delimited at least in part by an inner wall of the closing body (44). Suction device according to one of the Claims 14 to 16 , characterized in that the first channel (122; 216; 294) and / or the second channel (124; 218; 298) at least in a partial area along a lateral outer contour of the Closing body (44; 158; 188; 230; 268) runs, and in particular that a lateral outer wall of the closing body (44; 158; 188; 230; 268) the first channel (122; 216; 294) and / or the second channel ( 124; 218; 298). Suction device according to one of the Claims 14 to 17th , characterized in that the first channel (122; 216; 294) and / or the second channel (124; 218; 298) have at least one first area (126; 132; 136) and at least one second area (130; 138) wherein the at least one first region (126; 132; 136) is oriented transversely to the height direction (48; 204) and the at least one second region (130; 138) is oriented at least approximately parallel to the height direction (48; 204) and In a cleaning operation, a main flow direction in the at least one first area (126; 132; 136) is oriented transversely to the height direction (48; 204) and in particular is oriented radially, and in the at least one second area (130; 138) a main flow direction in the cleaning operation is oriented at least approximately parallel to the height direction (48; 204) and in particular axially. Suction device according to Claim 18 , characterized in that the first channel (122; 216; 294) and / or the second channel (124; 218; 298) have a deflection area (128) for a flow deflection. Suction device according to Claim 18 or 19th , characterized by at least one of the following: - at least one inlet of the first channel (122) is arranged on a first region (126) of the first channel (122); - At least one outlet of the first channel (122) is arranged on a second region (130) of the first channel (122); - At least one inlet of the second channel (124) is arranged in a first region (132) of the second channel (124); - At least one outlet of the second channel (124) is arranged on a second region (138) of the second channel (124). Suction device according to one of the Claims 18 to 20th , characterized in that the second channel (124; 218; 298) and / or the first channel (122; 216; 294) have first regions (126; 132; 136) spaced apart in the height direction (48; 204), between which a second region (130; 138) lies. Suction device according to one of the Claims 18 to 21st , characterized by at least one of the following: - in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) is a first area of the first channel (122; 216; 294) ) formed between an upper side of the closing body (44; 158; 188; 230; 268) and the counter device (74; 184; 252; 272); - A second region (130) of the first channel (122; 216; 294) is formed in the closing body (44; 158; 188; 230; 268); - In the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) are one or more first regions (126; 132; 136) of the second channel (124; 218; 298) and / or the first channel (122; 216; 294) and / or one or more second regions (130; 138) of the second channel (124; 218; 298) and / or the first channel (122; 216; 294 ) formed between the counter device (74; 184; 252; 272) and the closing body (44; 158; 188; 230; 268); - In the open position (220) of the at least one valve (208), a first region (222) of the second channel (218) is formed between an underside of the closing body (188) and the counter device (184). Suction device according to one of the Claims 14 to 22nd , characterized by at least one of the following: - the first channel (294) has at least one first input (296) and one second input (298) spaced apart from the first input (296); - The first channel (294) is T-shaped in cross section at least in a partial area; - The first channel (294) has a transverse area on which the first inlet (296) and the second inlet (298) are arranged, a collecting area (300) being arranged on the transverse area, and starting from the first inlet (296 ) a first partial flow (290) flows to the collecting area (300) and, starting from the second inlet (298), a second partial flow (292) flows to the collecting area (300); - The first channel (294) has a collecting area (300) which combines partial flows (290; 292) and a combined flow is guided through the closing body (268) to the at least one filter (22). Suction device according to one of the preceding claims, characterized in that the first contact area (276) and / or the second contact area (280) has a plurality of sub-contact areas (276a, 276b; 280a, 280b), in particular with at least one of the following: Sub-contact areas (276a, 276b) of the associated first contact area (276) are at the same height in relation to the height direction (274); - Sub-contact areas (280a, 280b) of the second contact area (280) are at the same height in relation to the height direction (274); - A first sub-contact area (276a, 280a) surrounds a second sub-contact area (276b, 280b); - Sub-contact areas are concentric to one another; - Between sub-contact areas (276a, 276b; 280a, 280b) a channel (294) is led through the closing body (268). Suction device according to one of the preceding claims, characterized in that the closing body (44; 158; 188; 230; 268) has a first disk element (54; 190) and one to the first disk element (54; 190) in the height direction (48; 204 ) has a spaced-apart second disk element (56; 194), the first contact area (70; 192; 234; 276) being arranged or formed on the first disk element (54; 190) and the second contact area (72; 196; 232; 280) is arranged or formed on the second disk element (56; 194), and wherein a connecting region (58; 164; 198) is positioned between the first disk element (54; 190) and the second disk element (56; 194). Suction device according to Claim 25 , characterized in that an outer contour (66) of the connecting region (58; 164; 198) is set back in relation to a lateral end (62; 64) of the first disk element (54; 190) and the second disk element (56; 194). Suction device according to Claim 25 or 26th , characterized in that the closing body (44; 158; 188; 230; 268) is C-shaped or U-shaped in cross section at the connecting area (58; 164; 198). Suction device according to one of the Claims 25 to 27 , characterized in that the counter device (74; 184; 252; 272) has a wall (78) which protrudes into a space (66) between the first disk element (54; 190) and the second disk element (56; 194), wherein in particular in the closed position (90) of the at least one valve (42), the first contact area (70) rests against the wall (78). Suction device according to one of the Claims 25 to 28 , characterized in that the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) point in the same direction in relation to the height direction (48; 204). Suction device according to one of the Claims 25 to 29 , characterized in that the first contact area (70) on the first disc element (54; 190) faces away from the at least one filter (22) and the second contact area (72) on the second disc element (56) from the at least one The filter (22) faces away, or that the first contact area (192) on the first disk element (190) assigns the at least one filter (22) and the second contact area (196) on the second disk element (194) assigns the at least one filter (22) ) assigns. Suction device according to one of the Claims 25 to 30th , characterized in that the first disk element (54; 190) and the second disk element (56; 194) have a different diameter. Suction device according to one of the preceding claims, characterized in that the counter device (74) and the closing body (44) are designed to be adapted to one another so that when the at least one valve (42) passes from the closed position (90) to the open position ( 108) the closing body (44) moves in the direction of the at least one filter (22). Suction device according to one of the Claims 1 to 31 , characterized in that the counter device (184) and the closing body (188) are designed to be adapted to one another in such a way that when the at least one valve (210) passes from the closed position (212) to the open position (220), the closing body (188 ) moves away from the at least one filter (22). Suction device according to one of the preceding claims, characterized in that the counter device (74; 184; 252; 272) has a first wall (78; 200) as a counter surface for the first contact area (70; 192;) and one in the vertical direction (48 ; 204) has a second wall (84; 202) spaced apart as a counter surface for the second contact area (72; 196). Suction device according to Claim 34 , characterized in that between the first wall (78) and the second wall (84) an opening is arranged on the counter device (74) which is in fluid communication with a normal pressure area (94), in particular a normal for a mouth of the Opening (98) is oriented transversely to the height direction (48). Suction device according to Claim 34 or 35 , characterized in that the closing body (44; 158; 188; 230; 268) engages over the first wall (78; 200) with a first disc element (54; 190) and a spaced-apart second disc element (56; 194). Suction device according to one of the Claims 34 to 36 , characterized in that the second contact area (72; 196; 232; 280) is movable between the first wall (78; 200) and the second wall (84; 202). Suction device according to Claim 37 , characterized in that a first space (85) is formed between the second wall (84) and the first wall (78), in which a second disk element (56) of the closing body (44) is movable, and between the first wall ( 78) and a further wall (87) a second space (89) is formed in which a first disk element (54) of the closing body (44) is movable. Suction device according to one of the Claims 34 to 36 , characterized in that the first contact area (70; 192; 234; 276) is movable between the first wall (78) and the second wall (84). Suction device according to Claim 39 , characterized in that a first space is formed between the second wall (84) and a further wall (87), in which a second disk element (194) of the closing body (188) is movable, and between the first wall (78) and the second wall (84) a second space is formed in which a first disc element (190) of the closing body (188) is movable. Suction device according to one of the preceding claims, characterized in that the filter cleaning device (34; 156; 182; 226; 260) has a magnetic device (102; 172). Suction device according to Claim 41 , characterized in that the magnetic device (102) has a switchable lifting magnet (104) and that an armature (106) is connected to the closing body (44), the closing body (44) via a coupling of the armature (106) to the lifting magnet (104) can be driven in its movement. Suction device according to Claim 41 , characterized in that the magnetic device (172) has a switchable holding magnet (174) and is connected to the closing body (158) on a counter element (178) for the holding magnet (174). Suction device according to one of the preceding claims, characterized by a spring device (116), the spring force of which tends to move the at least one valve (42) from the open position (108) to the closed position (90). Suction device according to one of the preceding claims, characterized by a hand actuating element (244) which is connected to the closing body (242) and is used for manual actuation of a cleaning process. Suction device according to one of the preceding claims, characterized in that the at least one valve (42; 166; 210; 228; 240; 266) and / or an actuating element (242) is assigned an elastic energy storage device (154). Suction device according to one of the preceding claims, characterized in that pressure-effective surfaces for the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) are different. Suction device according to Claim 47 , characterized in that the pressure-effective surfaces are adapted to one another in such a way that when the suction device is in operation, the at least one valve (42) is in the closed position (90) due to a pressure difference on the pressure-effective surfaces. Suction device according to one of the Claims 47 or 48 , characterized in that the pressure-effective surfaces are designed to be adapted to one another in such a way that a force must be exerted on the closing body (44) for the transition from the closed position (90) to the open position (108). Suction device according to Claim 47 , characterized in that the pressure-effective surfaces are adapted to one another in such a way that an external holding force is necessary to hold the at least one valve (166) in the closed position (165) when the suction device is in operation. Suction device according to Claim 50 , characterized in that when the holding force ceases, a pressure difference brings the at least one valve (166) from the closed position (165) to the open position (180). Suction device according to one of the preceding claims, characterized by a battery device (32) for battery operation, in particular the suction unit (16) and the filter cleaning device (34; 156; 182; 226; 260). Method for cleaning a filter (22), in particular with a suction device according to one of the preceding claims, in which the filter (22) is subjected to an air cleaning flow by lifting a closing body (44) of a valve (42) from a counter device (74) is, wherein in an open position (108) of the valve (42) scavenging air flows laterally past the closing body (44) and through the closing body (44) to the at least one filter (22), and / or with scavenging air in the open Position (108) of the valve (42) is coupled on several areas spaced apart in a height direction. Procedure according to Claim 53 , characterized in that in a closed position (90) of the valve (42) the closing body (44) with a first contact area (70) and with a second contact area (72) spaced apart in a height direction (48) on the counter device (74) is applied, and in the open position (108) of the valve (42) scavenging air flows past both the first contact area (70) and the second contact area (72) to the filter (22).

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